Here, r = 20/ 2 cm = 10 cm

Height = 30 cm

Circumference of the base of the

frame = 2πr

= 2π × 10 cm = 20π cm

Height of the frame = 30 cm

Height of the cloth needed for covering the frame

(including the margin) = (30 + 2.5 + 2.5) cm = 35 cm

Also, breadth of the cloth = circumference of the base of the frame.

∴ Area of the cloth required for covering the lampshade = length × breadth

= 35 × 20π cm^{2} = 35 × 20 × 22 7 cm^{2} = **2200 cm**^{2} Ans.